Jason Priestley says it best: “Well, this is weird.” He and his fellow Beverly Hills, 90210 costars have arrived at a hotel in Las Vegas for a 30th-anniversary panel celebrating the show, and when they first convene in the lobby, it is weird seeing them together. The once shiny-sexy stars of the ’90s teen soap — Priestley, Tori Spelling, Jennie Garth, Gabrielle Carteris, Brian Austin Green, and Ian Ziering — are now middle-aged adults, with the crow’s feet and fillers and general aura of ennui that status entails. The absence of the late Luke Perry hangs over them, quietly addressed but deeply felt.